PUSCH Retransmission Collision Avoidance via SRS Subframe Segmentation
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Solution Overview
Problem
The existing wireless communication systems face challenges in managing collisions between HARQ operations and additional SRS configurations, leading to potential throughput degradation due to unscheduled retransmissions of the physical uplink shared channel (PUSCH).
Innovation Solution
The proposed method involves configuring the SRS in areas other than specific subframes, allowing the second PUSCH to be transmitted based on the position of the SRS configuration, the initial PUSCH scheduling, or time division duplex configurations, thereby preventing collisions and optimizing retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional SRS is configured in all subframes to improve channel estimation accuracy, then channel estimation performance is improved, but collisions with HARQ feedback occur causing throughput degradation
Solution Approach 1:
The patent segments the radio frame by designating specific subframes (e.g., subframe 2 and subframe 7 in TDD configurations) as HARQ feedback subframes where SRS transmission is prohibited. This segmentation separates the functions of channel estimation and HARQ feedback into different time resources, eliminating collisions while maintaining channel estimation accuracy in non-HARQ subframes.
2Measurement precision
If SRS transmission is allowed in all subframes to increase reference signal availability, then channel measurement capability is improved, but retransmission reliability deteriorates due to collisions
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with knowledge of which subframes are designated for HARQ feedback transmission. The base station indicates HARQ feedback subframe configurations to the UE in advance, allowing the UE to proactively avoid SRS transmission in these subframes and reliably transmit retransmissions without collision.
3Measurement precision
If SRS is configured in every subframe to maximize uplink channel sounding, then channel state information accuracy is improved, but resource utilization efficiency deteriorates due to dropped retransmissions
Solution Approach 1:
The patent applies local quality by making the SRS configuration subframe-specific rather than uniform across all subframes. In HARQ feedback subframes, SRS transmission is prohibited to prioritize retransmission reliability, while in non-HARQ subframes, SRS transmission is enabled to maintain channel state information accuracy. This localized differentiation optimizes both measurement precision and resource utilization.
Data Source
AI summary
A method for transmitting a physical uplink shared channel (PUSCH) by a terminal in a wireless communication system according to an embodiment of the present specification comprises the step of: receiving sounding reference signal (SRS)-related configuration information; receiving downlink control information (DCI) for scheduling a first PUSCH; transmitting the first PUSCH on the basis of the DCI; and transmitting a second PUSCH.